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2. Lee Adler, “Time Lag in New Product Development,” Journal of Marketing, 30 (January 1966), 17–21.
3. Charles Alford and Joseph Mason, “Generating New Product Ideas,” Journal of Advertising Research, 17 (December 1975), 27–32.
4. Theodore Angelus, “Why Do Most Products Predict Failure?,” Advertising Age (March 24 1969), 85–86.
5. Peter Banting, “Unsuccessful Innovation in the Industrial Market,” Journal of Marketing, 42 (January 1978), 99–100.